Sadly the options for arranger modules is VERY limited. One module is the Ketron Midjay, but it's VERY expensive for an arranger module. I think it runs $1,700 (which is REALLY pricey for something that's just sounds/styles and no keybed).

Ketron also makes the SD3 and the XD3. Again fully featured arranger modules without the keybed. Even these to modules are VERY expensive.

[This message has been edited by squeak_D (edited 01-05-2009).]
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.